Windows 7 64-bit

I have just installed toon boom studio version 5.0 onto my computer which is running on Windows 7 Professional 64-bit, the installation went fine.But then when I tried to use the ellipse tool, the rectangle tool, the polyline tool, or the line tool (no matter which colour or size) a jagged/broken shape/line was drawn instead of a solid shape. My computer surpasses the hardware requirements of toon boom studio version 5.0 so i doubt it is a hardware problem. I have also changed the compability settions to Windows XP both on the shortcut on the desktop and the actual TBS.exe file in the program files on my c drive.
Please Help
Thanks you in Advance

You can try changing the Rendering Type to/from Direct3d and OpenGL in the Display tab of the preferences.

You can also try to update your graphic card drivers.